cppljevans’s gists

cppljevans / lambda_tagged_tuples.cpp

Last active August 29, 2015 14:02

Prototype of lisp like lambda's based on Dionne's post "Efficient tuple implementation"

	//Purpose:
	// Test if the code posted here:
	/*
	http://article.gmane.org/gmane.comp.lib.boost.devel/251897
	*/
	// With headers:
	/*
	From: Louis Dionne <[email protected]>
	Newsgroups: gmane.comp.lib.boost.devel
	Subject: Efficient tuple implementation

cppljevans / variable_templates.limits.max.cpp

Created November 21, 2014 21:56

demo n3651 with macro's illustrating when "duplicate declaration" is needed (at least with clang3.5)

	//Purpose:
	// Test compiler implementation of
	// "variable templates" as described in:
	/*
	http://isocpp.org/files/papers/N3651.pdf
	*/
	// and as commented on here:
	/*
	http://en.cppreference.com/w/Talk:cpp/language/variable_template
	*/

cppljevans / toy_why_define.cpp

Last active August 24, 2016 08:55

spirit toy.cpp modified to show need for BOOST_SPIRIT_DEFINE

	//Purpose:
	// Demonstrate the purpose BOOST_SPIRIT_DEFINE
	// is to implement recursive rules.
	//OriginalSource:
	// https://github.com/boostorg/spirit/blob/develop/workbench/x3/toy/toy.cpp
	//Modifications:
	// Rm'ed use of context to implement recursiion and replaced with
	// BOOST_SPIRIT_DEFINE
	//===========================================================================
	#include <iostream>

cppljevans / d0424r0_test.cpp

Created August 16, 2016 12:24

illuminate create_window code in D0424R0.pdf

	//Purpose:
	// Illustrate the workings of the create_window code found in attachment to:
	/*
	https://groups.google.com/a/isocpp.org/forum/?utm_medium=email&utm_source=footer#!msg/std-proposals/b1X597zMx9s/4fnQB6gBCwAJ
	*/
	//Modifications:
	// Renamed create_window to named_args and renamed many other
	// types and variables to make them more generic or readable.
	// Added several comments explaining purpose of various parts.
	// Added extensive print statements to illustrate how code

cppljevans / parse_sequence_container.cpp

Last active March 2, 2018 10:01

spirit pr370

	//Purpose:
	// Experiment with different methods for making code here:
	// https://github.com/Kojoley/spirit/blob/8b76132c8ded0c63b8ecc7d1689627ae49d1fde9/include/boost/spirit/home/x3/operator/detail/sequence.hpp#L419
	// a little more modular and help to answer question about
	// whether to use lamba's as posed by Joel here:
	// https://github.com/boostorg/spirit/pull/370#issuecomment-369410876
	//Result:
	// Works both when
	// defined(USE_CONSTEXPR_IF_LAMBDA)
	// and when

cppljevans / Show -I flag OK

Last active March 23, 2018 16:43

variant implicit conversion test

	-- mode: compilation; default-directory: "~/prog_dev/boost/releases/ro/boost_1_65_1/sandbox/kojoley/test/" --
	Compilation started at Fri Mar 23 11:20:46

	make -k ls
	ls -ld ../x3-variant-fixes/include/*
	drwxrwxr-x 3 evansl evansl 4096 Mar 22 19:40 ../x3-variant-fixes/include/boost

	Compilation finished at Fri Mar 23 11:20:46

cppljevans / x3-employee-annot_attr.cpp

Last active June 6, 2018 14:35

x3 employees using alternative to position_tagged

	/*=============================================================================
	Copyright (c) 2002-2015 Joel de Guzman

	Distributed under the Boost Software License, Version 1.0. (See accompanying
	file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
	=============================================================================*/
	///////////////////////////////////////////////////////////////////////////////
	//
	// A parser for arbitrary tuples. This example presents a parser
	// for an employee structure.

cppljevans / x3-only_1_xform-double_int.cpp

Created March 6, 2019 05:53

Joel's suggested changes (and a little more)

	//Purpose:
	// Follow Joel's suggestion about changing the
	// xform_rule attribute to double expressed here:
	// https://github.com/boostorg/spirit/issues/459#issuecomment-469476231
	//Result:
	// SAME result when defined(CALL_RULE_DEFINITION_SPECIALIZATION).
	// IOW, the wrong value for `attr_rule`. Without this define,
	// the results are as expected, i.e. `attr_rule` == 1235.
	// However, that's because, behind the scenes, spirit is
	// making a redundant (i.e. useless) call to the default

cppljevans / date_parser-force_attr_propagation.cpp

Last active February 16, 2020 10:06

date_parser solution to stackoverflow problem

	//Following code modifies:
	// https://gist.github.com/cppljevans/0fede2c9c2e57f25712528dab4e6aec7#file-date_parser-rm_as_define-cpp
	//by:
	// 1) adding a macro, USE_ALTERNATIVES
	// 2) using BOOST_FUSION_ADAPT_STRUCT
	// 3) using rule
	// 4) using force propagation flag in rule.
	//to:
	// show that even with attribute propagation, the attributes will not
	// propage when there's any ALTERNATIVE's.

cppljevans / sehe-coliru-stackoverflow-answer.cpp

Created March 6, 2020 12:19

skipper in recursive context leads to infinite template instantiation

	//OriginalCode:
	// http://coliru.stacked-crooked.com/a/d149f05af81bf0cf
	//WhichWasAnswerTo:
	// https://stackoverflow.com/questions/45899090/recursive-rule-in-spirit-x3/45900983
	//DownloadedOn:
	// 2020-03-06.0512CST
	//Modifications:
	// WHAT:
	// * added macro, USE_TOP_LEVEL_SKIPPER
	// * depending on defined(USE_TOP_LEVEL_SKIPPER)

Larry Evans cppljevans